Self-cooled electric motor



Aug.; 2s, i923.

R. A. ILG SELF COOLED ELECTRIC MOTOR Filed Aug. 4 1921 www @55 B l l I l Patented Aug. 2'8", 1923. i y

Unirse'SIA-*rss nOBERT A, ILGQOF CHICAGO,` ILLINOIS, nssIGrNo'nA To. ILG ELiioTnIovENirILe'rING OOMPANY, or CHICAGO, ILLINOIS,A` A coaronnrronlorLOUISIANA,' v

Y Appncationmea' august 4,1521. seiaiznaasaess. .i

-To-aZZ whom/tracy concern. Vi v f Be it known-thatl, ROBERT AJILG, a

citizen-fof the United States, residinv .at

Chicago, in thecounty of Cook and tate of'Illinois, have invented certain newV and( useful Improvements in Self-Cooled Electric .Motors, of` which the 'following is a specification;

This inventionl relates toy improvements in self-cool`ed electric motors.V lThe present virnprovemei'it 'is designed more particularly foruse on electric motorsused on direct driven fans and blowers, and embodiesfthe `same broadV principle as that disclosed in my Y granted September `.118, 1906. `VIn the said patent there is-shown an' electric Inotoi1v directlydriving a Ventilating fan, a hood completely envelopingfthe inotorrand'open on the end thereof adjacent to the fan, and an air inlet pipecommunicating with the hood land serving to admit a current of cooling Y -patentabovegidentilied,` by leading Lthe current of cooling airdirectly into the motor` itself" through the field of the latter so that it may not only Y circulate "through the field, but may also impinge direct- Vly 'upon the vrapidly revolving Y ture.` A further object of fthel invention is to clieapen the construction, of the motor supporting frame, and thisV is done by futi llizing ythepip'e which conducts the cooling air into the' motor as one yofthe radial sup- .V porting arrnsof the motor supporting ring or frame.

A Still 'further objectief@ provide,

, lieu of Vthe'ho'od heretoforeY used which enf the inducedfair wholly to theV internal parts of the'` motor, which most need'cooling, Aand velopes the motor and its framefa simplified and limproved construction Vfory closing the ends 0f the .motor Afr-ame, except; forA an' `outflow openingvatfone end,so as to confine former vLetters Patent No. `S31-,2821,

arma- Yat the'v saine :time allow ready access' tothe coinmutatorbrushes l My'invention, tsV novel principles of operation, and the advantages inheringi therein vwill be readily` understood by persons familiar with Athe art'ffrom the followingV *detailed description, taken lin connection with the accompanying drawing in which l i VI'liave illustrated oneV approved 'embodi-z ment of the-invention, andwhereine-V K Fig. 1 is a side elevation, Spartly iin ver'- tical section of my improved cooling delvice, shown applied to the-motor and a direct driven electric Ventilating fan; and

7 Fig. 2 is a verticalsectionyon the line Y242 of Fig.y 1, looking in the directionsindicated by the arrows.

ing 6, fitted` to which is aringf formed with a -radial flange` 7lwhich lits against the' inner surface of the vwall 5V surround- Ving the openingj. On theperiphery of vthe flange 7 vare attaching lugs 8 apertured for the vpassage of fastening screws *by which 'the ring is secured to the wall 5.

On" the outer face of the flange 7 are other lugs 9 to which are secured by bolts l()` Referringto the drawing, .5 indicates a e vertical wall in which is a circular openthe outer ends of a pair of elbow-shapedk 'arinsl 11, thef inner ends of which are secured by bolts 12 to radiallugs 13 formed on a motor supporting .ring-14. The lower side of the ring 14 is formed with `a tapped boss 15 in which is entered therupper threaded end of an elbow-shaped pipe 16.

rlvhe lower horizontal endfofithe pipe Y'16 a. flange 18 apertured to receive fastening screws 19 by which 'said' sleevefis .secured to the face' ofthe lower attachinglugfS.

, VThis latter a't a 'point opposite theopen end of the pipe 16 is formedwithan open- -is threaded into a tapped sleeve `17 4having y ing registering with'the latter,and thisl opening preferably consisting; of the l bore of 'a 'hollowboss 20 formed on ,the outer Y side of the attaching'lug 8.1

The motor itself embodies theusual; and

well-known structure ofan electric motor,

including tlief circularv field frame 21 which is embraced by the ring 14, the pole pieces 22 attached to the field frame, the coils 23 encircling the pole piece 22, the armature designated as a whole by 24C, and the armature shaft 25.

The outer end of the armature shaft 25 is journaled vin an `anti-friction bearing carried by a conical skeleton frame piece 2G, one end of which is fitted and secured to one side oi the circular field frame 21. The shaft 25 on the opposite end of the motor is jonrnaled in anti-friction bearings in a cap or cover 27, that is similarly lit'ted and secured to the other side of the field 'frame 21. The lower side of the field frame 21 is formed with a radial opening 28 that registers withthe upper end of the pipe 1G, said opening 28 also registering with the space .between a pair oit' adjacent field magnets, as

clearly shown in Fig. 2, thereby providing a continuously open passage way through the `pipe 1G` of the motor supporting ring, and the field `frame and magnets, tothe sur-face of 'the Y armature. 1

In the upper portion of the cap or cover 27 there is formed an out'tlow opening 29 having substantially the cross-sectional area ot. the inflow. pipe 1,6.

Surrounding and covering the major portion of theskeleton trame 26 is 'a conical sleeve 30 which completely covers the openings in said skeleton frame, said sleeve carrying a spring catch 31 formed with a loclring pin 32 that, when the sleeve is in place -sna )s into ar hole 33 in the 'trame 2G and thus Vlocksfthe covering sleeve in place. By reason of the described construction, the internal parts of the motor are completely `housed'or enclosed except ttor the opening 28 which con'nnunicates with the pipe 1G and the opening 29 which l\.ads into the space directly behind a ventilating -ian whichl is mounted on. the armature sharlt 25 and revolves within the circular iframe or casing''.

lVhen current is turned on, the fan is rapidly revolved and a current oil: cooling air isthereby induced into and through the motor, this cooling current ol air 'Flowing upwardly through 'the pipe section and the opening 2S in the held .trame 21. and around the armature and the tield magnets, and thence through the outflow opening 29, whereby the heat generated within the riotor is rapidlyabstracted and carried oft.

`The pipe 16, located and 'applied as described, not only serves the function olf a conductor forthe cooling air, but also constitutes one 'of the supporting arms ot the motor and motor'fraine, taking the place olf one ofthe supporting arms 11 heretofore employed in addition to the air supply pipe. T his conducesto economy ot both material and space.

The outer.l hood or. coverBQ- permits the employment oi a supporting frame for the outer end ot the armature shatt, having sutilciently large openings to ali'ord access to the commutator brushes when the cover is removed, Vthus making it minecessary to disturb the outer bearing in order to get at and replace the corninutator brushes as required.

lt is believed that the novel strruftural features and the practical advantages olf the invention willbe apparent 'troni the foregoing in connection with `the illustration7 and without requiring t'urther detail description. l maire no claim herein to the feature olf conducting a current cooling air into the field ot an electric motor, otherwise than in combination with other structural. features of special value and utility in a. motor oit lthe type and :tor the purposes herein described, and as set 'forth in the tollowing claims.

I claim.: l

1. The combination, with a nuilti-polar electric motor hai/'ig a circular iield Ytrame tormed with a radial hole therein between. adjacent poles. ot a motor-supporting ring embracing said field Yt'ranu?. and torngied with afradial hole registering with the hole ot the flatter, a pipe for the inihiction oi cooling air communicating with the hole ot said ring, a cover secured to one side ot said field frame and having' a hole tor the outflow ot heated air, a skeleton iframe piece secured to the other side o't` the field 'trame around the con'imutator o'lt the motor, and a removable cover surrounding and enclosing said skeleton lrame piece.

2. The combination, with a multi-polar electric motor having a circular Held trame formed `Vwith a radial hole therein between adjacent poles, ot a` niotor-supporting ring embracing said lield 'frame and tornuu'l with a. radial, hole registering with the hole ot' the latter, a pipe itor induction oi cooling air communicating with the hole oit Said ring, a cover seein-ed to one side ot' said field frame and carrying a bearing vfor one endo't the armatureshaft oil? the motor. said .cover having a hole ttor the outiow ot .heated au'. a-slreleton .rame piece secured to the other side o' the Geld 'frame around the a circular field iframe formed with a radial Vhole at its lowest point between adjacent poles, of a motor-supporting ring einbracing said field iframe and Yformed with a radialhole registermgwith the hole ot the latter, a plurality o'l.E "adially disposed arms motor, said cover having a hole for the outattached to the other side of the field frame around the commutator of the motor and carrying ahearing for the other end of the armature shaft, and a removablecover surrounding and enclosing said skeleton frame l5 piece.

' RoBERT A'. ILG.

flow of heated air,ia skeleton frame piece 1 

